Improvement in machines for forming auger-bits



WILLIAM A. wis.

lmprovemerlt in Machines for Forming Auger Bits.

N0, 124,683,. Patent're'd March19,'1"872..

/mggo l 1J 6 y f E ml yW. A. IVES, OF NET HAVEN, CONNECTICUT.

IMPROVEMENT IN MACHINES FOR FORMING AUGER-BITS.

Specification forming part of Letters Patent No. 124,683, dated March 19, 1872.

ment in Machine for Forming the Lips to Auger-Bits; and I do hereby declare the following, when taken in connection with the accompa-nying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this, specication and represent, in

Figure 1, a top view; Fig. 2, a side view; Figs. 3, 4, 5, 6, and 7, views of detached parts; and in Figs. 8 and 9, side views of angers for the better illustration of my invention.

I n the manufacture of augers and similar boring instruments the lips have heretofore been turned and formed by hand, forging with hammers made for the purpose, and requiring the best skilled labor, and is the most expensive part of the process in the manufacture of augers. By the term au gerl wish to be understood as embracing generally boring instruments. By my invention this labor to a great extent is dispensed with, the process simplified, and the expense consequently. greatly reduced; and the invention consists in the arrangement of a revolving mandrel combined with suitableholding dies, which mechanically spin or draw the lips of the auger into the required shape.

To enable others skilledin the art to construct and use my invention, I will proceed to describe the same as illustrated in the accompanying drawings.

A is the bed of the machine, supported upon legs B 5 C, a shaft, supported and so as to revolve freely in bearings D, and by preference is driven by the application of power to a loose pulley, E, connected with the shaft by a clutch, c. F is a mandrel supported and so as to revolve freely in bearings F by the application of power thereto through a pulley, F". The axis of the said mandrel F is at right angles and nearly or exactly in line with the axis of the shaft C, as seen in Figs. 1 and 2. The said mandrel is represented in section enlarged in Fig. 5 5 is made hollow, so that a spindle, G, passes through its center so as to strike a cam, a, on the shaft C, the spindle arranged so as to move longitudinally through the mandrel. The mandrel also has a longitudinal movement in itsbearings, forced back bymeans of a spring, as seen in Figs. l and 2, the head of the mandrel being formed s o that a cam, b, upon the shaft C will at the proper time strike and force the mandrel forward. In the outer end of the spindle Gr a die, c, is formed of the diameter of the auger to be operated upon, and in form correspondingto the shape of the lip and point of the auger when finished. Over the die c, and in the end of the mandrel, is fixed a sizing-die, d, the die c working freely through the die also that the die c passes on over and so as to size the end ofthe auger. I are the holding dies, represented in Fig. l as open, the dies shown detached and enlarged in Figs. 3 and 4, Fig. 3 being a central view, and Fig. 4 an end view. The end of the die I is formed so as to lie in the twist of the auger at the extreme end, and of the shape which it is Vrequired to form the lips, as seen ati in Figs. 3 and 4. The dies are clamped together when the auger-blank is placed between so as to grasp and hold the auger firmly and in position centrally before the mandrel F, and when fixed in this position, and the shaft and mandrel (which has been previously heated,) and bythe revolving motion of the die c the end of the auger is spun or turned down onto the holding die i, forming the point and lip or lips of the auger. Then to turn up the lip and size the end of the auger the cam b strikes and forces forward the revolving mandrel F, so that the die d passes on over the end of the auger, turning thelip up, and bringing the end of the auger to the required size; then the auger is removed from the machine, a second placed therein and operated on as before. For dif ferent-sized augers it will be understood that different dies are introduced into the same machine.

As thus far described, the machine is adapt ed especially for the angers seen in Fig. S Without spurs, the curve of the lip avoiding the use of the spur 5 but if for spur-angers, as seen in Fig. 9, the die c should be formed as seen in Fig. 7, so as to spin the lip, leaving a `recess atv the edge of the die c for the forrnation of the spur, then, after the end is formed of boring instruments, I claim the arrangement of two dies, the one Within thcother, the

inneror central die operating to form the point and Hoor-lip or lips, the outer passing over the other or inner die to turn up and size the lip or lips, substantially as specified.

2. In combination with the dies c and e, I claim the holding dies z', substantially as and for the purpose specied.

3. In combination with the mandrel F and spindle G and carrying-dies e and d, I claim the cams a and b, so as to operate the said dies, as and for the purpose specified.

Witnesses: W. A. IVES.

A. J. TrBBITs, J. H. SHUMWAY. 

